Vacuum tube construction



1935. c. J. KAYKO VACUUM TUBE CONSTRUCTION Filed Aug. 12, 1929 2SheetsSheet l Feb. 5, 1935. c. J. KAYKO VACUUM TUBE CONSTRUCTION FiledAug. 12, 1929 2 Sheets-Sheet 2 Jwuani'oz Charles .7. Kay/0 Patented Feb.5, 1935 PATENT OFFICE VACUUM TUBE oonsgrnnc rlon Charles J; Kayko,Jackson, Mich., assignor, by

mesne assignments, to The Sparks-within m a Jaeksqn, wit ns rafiqeApplication August 12, 1929, Serial No. 385,173 6 Claims. (01. 259 275)invention relates to vacuum tubes of the type employing cathode, gridand plate elements. object of my invention is to devise simple andrugged structure for supporting and maintainingthe elements of a vacuumtube in proper w ed ela o Another object is a novel method of mountingandcentering the filament within the grid elemen 'A further object is tosimplify the method of I assembly of the elements of the novelvacuumtube"s tructure which I have devised.

My invention is illustrated in the accompanying drawings in which:

. Fig'ure'1' is a side elevational View of the vactube assembly mountedupon the stem of the tube Figure 2 is a side View of Figure 1 with apart of the-plate element broken away;

Figure 3 ma plan view of the assembled structure shown at Figures land2;

"Figure 4 is a unit assembly of the supporting wiresand the filamentmounted upon the stem of the tube; i

Figure 5' is aside view of a unitassembly of the plate "and gridelements;

iFigure 6 is a side view of Figure 5; and

Figure? is a plan view of the unit assembly showninFigures 5'and6.

@Referring to Figures 1, 2 and 3, I have shown the assembled structureofthe vacuum tube which ILhaVe devisedmounted upon the stem 1, ready tobe sealed into the glass envelope (not shown). 141 indicates the usualsealing-off tube connection to the stem 1. The plate element 2 comprisestwo like. sheetm ta e ement ja a d. 2b W ded together at spaced pointsalong the lines indicated at 2.0 an 2d he ed e of the te m mbers ondthewe dinslin s. re qrm t encircle n lam hesu p rt ns W od a f, th lowerends of which are welded, respectively, to

up qr in Wir slet z 3 5531.? 1 0 hi ilh 0 the S e n ed is provided witha terminal wire 22', which serves as t h l eadin g-in wire for the plateelement 2; The grid comprises a wire 3 Wound in helical fashionaround'tw'o parallel wire rods 3a and 312, each turn o'fith' wir 3 beingpreferably secured to the rods asiby Welding. The 'rfods 3a'and 3b arewelded at their .lowerends to angle-rods 3'0 and 3d sealedweided'ito'wire "angle-rods 4a and 4b sealed into the pinch of stem 1.The middle of the filament 41s looped back to a point between the twoends anidlis anchored by a wire hook 4c welded to an an le-rod idseal'edinto the pinch of stem 1. Anl rods ia' and" 4b are provided withterminal Q 4g and lh which serve as leading-in conductorsfor thefilament. 'The upper loops of filan'ient"w irfe 4 aresupported byspring-wire hooks 4efand4f'supported'from rods 5] and 5g anchoredinaglass arbor S The filament 4 may be treated or'coatedinfanywellknovvi manner to increase ts'elqtro i m m c va arbor 5 is supportedfrom the plate element 2 by two inverted l J-shaped wire rods 5a and512, one leg of each beingiwelded to the plate 2, and the free endsbeing "embedded inthe arbor'at points nearthe ends, The arbor 5 is alsopar tially supported from angle-redid by means of rod 6 welded to theend of angle-rod 4d and to a r6d5canchorediii'arbor 5. 'The gridstructure is securedagainst 'lateraFdisplacement by two angle-rbdsSd'and 5e, one end of each being anchored in arbor 5' and the other endsbeing welded respectively to thesupportirig rods 3;; and 3b. 'rod 6extends below the angle-rod 4d and supports at its vlower end a flashingcup '7, which contains suitable flashing material such as magnesium'. v

In the rn anufacture of my tube, I prefer to asserr ible "th'e"structure in unit assemblies as indicated in' Figures 4to' '7'. The stemassembly indicated in iffig uire 4 preferably formed by sealiiig' intothe pinch of the stem 1 seven wires of equallength corresponding to thewire rods 2g, 3a, 4a, 4d, 4h, 3d and 2h, respectively. These wires areembedded in the pinch in one operation', and are then cut to properlength and formedto the proper shape. Wire' 4d is bent at rightang'les'to the plane of the pinch, and the remaining wiresare"bent' inthe plane of the pinch and symmetricallyaboufia central axis. Thefilament 4, \yithvvire hook 4c, is'ne'xt placed in 'position 'and theends welded to supporting Wires 4o and' lb, the hook be'in'welded'towire'4d.

The arbor'assembly am preferably formed by embedding seven straightwires into the glass rodSinbne operation. The Wires are then cut to theproper length "and formed to the proper shape. The arbor assembly isthen secured to the plate element assembly by welding wire rods 56;and'bhtothe plateelem'ent along the lines and 2d.

The grid assembly comprising the wire grid 3 wound ar'ound parallel wirerods '31: and 3b is next "centered within the plate element/2, and

weldedgrespectively; to angle-rods 3c and 3d; 'By this operation thelower end of the grid and plate elements areautomatically positionedwith respect to each other by the angle-rods supported in the pinch ofstem 1. The vertical rod 6 is next welded to the wire 5c mountedin arbor5 and to the end of angle-rod 4d embedded in the pinch of stem 1 andextending at right angles to the plate and, grid elements. Thisarrangement supplies added strength against lateral'displacement orbending of the grid and plate elements in a planeat right angles to theplane of the pinch of the stem, and also serves to help support thearbor 5 with its, assembly. 'The spring hooks 4e and' ij are next hookedto the upper loops oflfilament 4 and are welded, respectively, to rods5) and 5g'supported from arbor 5.' Supporting rods 5] and 5g are made ofductile wire such as copper or nickel, and will remain in any positionto which 'th'ey'are bent unless acted upon by a force greater than theresistance to bending. As shown in Figurel, the spring hooks are weldedto, rods 5 and 30 59in such position that the filament loops areelf-center with respect to the grid element. After the spring hooks arewelded to the supporting rods'these ductile rods are bent to the dottedpositionshownin Figure 1 to place the springs under proper tension andto center the loops of filament 4 with respect to the grid element. The

filament is shown properly centeredin Figure 3l It will be understoodthat the assembled structure shown in Figures 1 to Bis sealed within aglass envelope which is then exhausted and sealedofi, through tube 1a,and a connector plug is ,mounted on the envelope in the usual Way.

"'Fromihe foregoing description of my invention, it will be apparentthat the rugged structure whichI have devised is particularly effectivein reducing microphonic and other noises due to mechanical vibration ofthe tube elements.

WhatrI claim is: a

,1. In a vacuum tube structure, the combination of .a'stem having asingle pinch, a plate element supported from said pinch by twoconductors embedded in said pinch at spaced points, an insulating arborsupported from said plate element intermediate the ends thereof, a thirdconductor embedded in said pinch and extending at right angles to theplane of the plate supporting conductors, a connection between saidthird conductor and said insulating arbor, whereby saidrplate element isgiven tlateral support, a grid'element, located within said plateelement and having supporting rods extending beyond the end of theplate'element, and angle-rods embedded in said arborand extending acrossthe end of said plate element and being secured to said grid rods incrossed engagement.

f 2 In-a vacuum tube structure the combina tion of a plate elementincluding twospaced parallel conducting walls,'a grid element mountedbetween said walls comprising two spaced parallel rods extending beyondsaid wallsat one end and having a wire wound around said rods in spacedconvolutions and an insulating arbor supported from one of said wallsintermediate the 1 ends thereof by arpair or U-shaped brackets and fromsaid parallel grid rods by means of a pair of angle rods anchored insaid arbor and 6X1- tending parallel to the plate beyond the end thereofand then across the end of the plate to;

the grid rods at right angles thereto. 7

3. In a vacuum tube structure, the combination of a stem having as'inglepinch, aplate element supported from said pinch 'by't'woconductorsimbedded in said pinch at spaced points, an

insulating arbor. supported from said plate ele-' 7 ment intermediatethe ends thereof, athird conductor imbedded in said pinch and extendingat right angles to the plane'of the plate supporting conductors, aconnection between said third said plate element is given lateralsupport, a grid element and being secured tosaid grid rods in crossedengagement, a looped filament located within said grid element having atleast" one', 7

bight, and having its terminals secured to lead-in conductors in saidpinch centered withrespect to said grid element, a ductile rodimbeddedin said arbor andextending beyond the end of said plate element, andaspring member supported by said ductile rod andhaving its freeendengaging the bight of, said filament, said ductile rod being bent ina direction away rrom the plane of; the plate-element to tension saidspring member andsaid filament, and to center a loop of said filamentwith respect to saidgrid element.

4. In a vacuum tube structure, the combination of a stem having a singlepinch, a plate element supported from said pinch by two conductorsbedded in said pinch at spaced points, an insulating arborsupported:fromsaidplate element in termediate the ends thereof, a thirdconductpr imbedded in said pinch and extending at right. angles to theplane of the plate supporting conductors, a; connectionbetween saidthird conduc tor and said insulating arbor whereby said plate 1 elementis givenlateral support, a loopedgfila- V ment located within said plateelement having at least one bight, a ductile "rod imbedded in said Iplate element to tension said spring member and said filament, and tocenter a loop of said filament 'with respect tosaid plate-element. 5. Ina vacuum tube structure, the combination oi-a plate element includingtwo spaced parallel conducting walls, a grid element mounted 'be-p fromone of said walls intermediate the ends thereof by a pair of U-shapedbrackets and'fromsaid parallel grid rods by means of a pair of anglerods anchored in saidarbor and extending parallel to the plate beyondthe end thereof, and

then across the end of the plate to the grid rods at right anglesthereto, a looped filament located within said grid element having atleast one bight, a ductile rod imbedded in said arbor and extend-. ingbeyond the end of said plate element, and a spring member'support'edbysaid ductile rod and having its free end engaging thebight of saidfilament, said ductile rod being bent in'a direction tween said Wallscomprising two spaced, parallel rods extending beyond said walls at oneend, and having a wire'wound'aroundsaid rods in spaced" convolutions,andan insulating arbor supported away from the plane of the plateelement to tension said spring member and said filament and to center aloop of said filament with respect to said grid element,

6. In a vacuum tube structure, the combination of a plate elementincluding two spaced parallel conducting walls, an insulating arborsupported from one of said walls intermediate the ends thereof by a pairof U-shaped brackets, a

10 looped filament located between said walls having at least one bight,a ductile rod imbedded in said arbor and extending beyond the end ofsaid plate element, and a spring member supported by said ductile rodand having its free end engaging the bight of said filament, saidductile rod being bent in a direction away from said walls to tensionthe spring member and said filament and to center a loop of saidfilament with respect to said plate element.

CHARLES J. KAYKO.

